JP2019516107A - Vehicles including diagnostic systems for electrical fuses - Google Patents

Abstract

A vehicle is provided that includes a diagnostic system for an electrical fuse. The vehicle includes first and second voltage sensors, a current sensor and a microcontroller. The first and second voltage sensors respectively generate first and second signals indicative of first and second voltage levels respectively at first and second ends of the fuse. The current sensor generates a third signal indicative of the current level flowing through the fuse. The microcontroller determines the first voltage value and the second voltage value based on the first and second signals, respectively, determines the current value based on the third signal, and determines the first and second voltage values and the current value. To determine the first resistance value. The microcontroller generates a diagnostic signal indicative of degraded operation of the electrical fuse if the first resistance value is greater than the end of life resistance value. [Selected figure] Figure 1

Description

  The invention relates to a vehicle including a diagnostic system for an electrical fuse.

  This application claims priority based on US Patent Application No. 15 / 375,463 filed on December 12, 2016, and the contents disclosed in the specification and drawings of the corresponding application are all incorporated in the present application. Ru.

  Electrical fuses are a type of automatic circuit breaker used to prevent over current from continuing to flow in a wire. For example, an electrical fuse operates in such a way that it disconnects the wire by melting itself with the heat generated by the overcurrent flowing through the wire.

  Generally, the resistance of the electric fuse is smallest at the beginning-of-life resistance, and gradually increases as it ages, and the resistance at the end-of-life resistance is the largest. Therefore, the electrical fuse should operate so that the wire is disconnected if an overcurrent flows on the basis of the resistance value at the end of the lifetime of the electrical fuse.

  However, when the aging of the electric fuse progresses due to the repetition of charging and discharging of a large current or long-term use, a deterioration phenomenon may occur in which the resistance value of the electric fuse increases beyond the end of life resistance value. If the electrical fuse degrades, the instantaneous temperature rise may damage the fuse itself, possibly leading to an explosion or fire accident.

  Many such degradation phenomena of electric fuses occur gradually and accurate diagnosis is difficult. Therefore, there is a need in the art for a technology that can accurately diagnose the degradation phenomenon of the electric fuse. Such requirements increase the complexity of the diagnostic circuit.

  The inventor of the present invention has recognized the advantages of a vehicle that includes an electrical fuse diagnostic system to determine when the electrical fuse has degraded operation and approached when the operational life of the electrical fuse is over.

  Other objects and advantages of the present invention can be understood by the following description, and become apparent with reference to the embodiments of the present invention. The objects and advantages of the present invention can also be realized by the means as claimed and combinations thereof.

  Various embodiments of the present invention for achieving the above object are as follows.

  A vehicle is provided that includes a diagnostic system for an electrical fuse according to an embodiment of the present invention. The electrical fuse electrically connects between the battery and the electrical load.

  The vehicle includes a first voltage sensor generating a first signal indicative of a first voltage level at a first end of the electrical fuse.

  The vehicle further includes a second voltage sensor generating a second signal indicative of a second voltage level at a second end of the electrical fuse.

  The vehicle further includes a current sensor generating a third signal indicative of the amount of current flowing through the electrical fuse.

  The vehicle further includes a microcontroller operatively connected to the first voltage sensor, the second voltage sensor, and the current sensor.

  The microcontroller comprises a memory device for storing a first table. The first table includes a plurality of resistance values and a plurality of current values related to the electric fuse.

  The microcontroller determines a first voltage value and a second voltage value based on the first signal and the second signal, respectively.

  The microcontroller determines a current value based on the third signal.

  The microcontroller determines a first resistance value of the electrical fuse using the first voltage value, the second voltage value, and the current value.

  The microcontroller retrieves a first stored resistance value from the plurality of resistance values included in the first table, using the current value as an index to the first table.

  The microcontroller multiplies the first stored resistance value by a first value to obtain an end-of-life resistance value. The microcontroller generates a first diagnostic signal indicating a degraded operation of the electrical fuse if the first resistance value is greater than or equal to the end-of-life resistance value.

  Further, the plurality of resistance values of the first table may correspond to a lifetime initial resistance value for the electric fuse.

  Also, the electrical fuse may be a high current delay operation electrical fuse.

  Also, a vehicle including a diagnostic system for an electrical fuse according to an embodiment of the present invention further comprises a vehicle control in operative communication with the microcontroller, the vehicle control receiving the first diagnostic signal. And generating a fuse service message displayed on the vehicle display device in response to the first diagnostic signal.

  Also, the microcontroller may determine the first resistance of the electrical fuse only if the current value is greater than a threshold current value, and may generate a first diagnostic signal as described above.

  A vehicle is provided that includes a diagnostic system for an electrical fuse according to another embodiment of the present invention. The electrical fuse electrically connects between the battery and the electrical load.

  The vehicle includes a first voltage sensor generating a first signal indicative of a first voltage level at a first end of the electrical fuse.

  The vehicle further includes a second voltage sensor generating a second signal indicative of a second voltage level at a second end of the electrical fuse.

  The vehicle further includes a current sensor generating a third signal indicative of the amount of current flowing through the electrical fuse.

  The vehicle further includes a microcontroller operatively connected to the first voltage sensor, the second voltage sensor, and the current sensor.

  The microcontroller comprises a memory device for storing a first table. The first table includes a plurality of resistance values and a plurality of current values related to the electric fuse.

  The microcontroller determines a first voltage value and a second voltage value based on the first signal and the second signal, respectively.

  The microcontroller determines a current value based on the third signal.

  The microcontroller determines a first resistance value of the electrical fuse using the first voltage value, the second voltage value, and the current value.

  The microcontroller retrieves a first stored resistance value from the plurality of resistance values included in the first table, using the current value as an index to the first table.

  The microcontroller generates a first diagnostic signal indicating a degraded operation of the electrical fuse if the first resistance value is greater than or equal to the first stored resistance value.

  Further, the plurality of resistance values of the first table may correspond to an end-of-life resistance value for the electric fuse.

  Also, the electrical fuse may be a high current delay operation electrical fuse.

  Also, a vehicle including a diagnostic system for an electrical fuse according to another embodiment of the present invention further includes a vehicle control unit in operative communication with the microcontroller, the vehicle control unit including the first diagnostic signal. A fuse service message may be generated that is received and displayed on the vehicle display device in response to the first diagnostic signal.

  Also, the microcontroller may determine the first resistance of the electrical fuse only if the current value is greater than a threshold current value, and may generate a first diagnostic signal as described above.

  According to at least one embodiment of the present invention, the stored lifetime initial resistance of the electrical fuse and the multiplication operator and the calculated resistance may be used to diagnose degraded operation of the electrical fuse.

  Also, according to at least one embodiment of the present invention, diagnosing the degraded operation of the electrical fuse using the stored end-of-life resistance value of the electrical fuse and the multiplication operator and the calculated resistance value it can.

  The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

BRIEF DESCRIPTION OF THE DRAWINGS The following drawings, which are appended to the present specification, illustrate preferred embodiments of the present invention, and serve to provide a further understanding of the inventive concept as well as the detailed description of the invention. It should not be interpreted as being limited to the matters described in the drawings.
FIG. 1 is a schematic block diagram of a vehicle including a diagnostic system for an electrical fuse according to an embodiment of the present invention. FIG. 7 shows the data structure of the first table stored in the memory device of the microcontroller used in the diagnostic system of FIG. 1; 5 is a flow chart illustrating a method of determining electrical fuse degradation according to an embodiment of the present invention. 5 is a flow chart illustrating a method of determining electrical fuse degradation according to an embodiment of the present invention. Fig. 7 shows the data structure of a second table stored in the memory device of the microcontroller used in the diagnostic system of Fig. 1; 5 is a flow chart illustrating a method of determining electrical fuse degradation according to another embodiment of the present invention. 5 is a flow chart illustrating a method of determining electrical fuse degradation according to another embodiment of the present invention. 5 is a flow chart illustrating a method of determining electrical fuse degradation according to another embodiment of the present invention.

  The present invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. Prior to this, the terms and words used in the present specification and claims should not be interpreted as being limited to the ordinary or lexical meanings, and the inventor himself should describe the invention in the best way. The meaning and concept should be interpreted according to the technical idea of the present invention on the principle that the concept of terms can be properly defined.

  Accordingly, the embodiments described in the present specification and the configuration shown in the drawings are only the most preferable embodiments of the present invention, and do not represent all the technical ideas of the present invention. It should be understood that there are various equivalents and modifications that can be substituted for these at the time of filing.

In addition, when it is determined that the gist of the invention can be found turbid, a detailed description of the known structure or function related to the present invention will be omitted.
Throughout the specification, when a part “includes” a certain component, it may not include the other component but may further include the other component unless specifically stated otherwise. means. Also, the term "control unit" described in the specification means a unit that processes at least one function or operation, which is embodied by hardware, software, or a combination of hardware and software. It can be done.

  Furthermore, throughout this specification, when one part is "connected" to another part, this is not only in the case of "direct connection" but also in the middle Also includes the case where they are “indirectly connected (connected)” via other elements.

  Referring to FIG. 1, a vehicle 10 is provided according to an embodiment of the present invention. The vehicle 10 includes a battery 20, an electrical fuse 22, an electrical load 24 and a diagnostic system 26 for the electrical fuse 22.

  An advantage of the diagnostic system 26 is that the stored lifetime initial resistance value and multiplication of the electrical fuse 22 is performed to determine whether the electrical fuse 22 performs degraded operation, ie, the performance of the electrical fuse 22 has degraded. Either using the operator and the calculated resistance value, or using the stored end-of-life resistance value of the electric fuse 22 and the calculated resistance value.

  A battery 20 is provided to provide the electrical load 24 with an operating voltage. Battery 20 includes a negative electrode terminal 42 and a positive electrode terminal 40. The positive electrode terminal 40 is electrically connected to the current sensor 70. The negative terminal 42 is electrically connected to the second end of the electrical load 24. In one embodiment of the present invention, the battery 20 may be a lithium-ion pouch battery.

  The electrical fuse 22 is electrically connected in series between the current sensor 70 and the first end of the electrical load 24. The electrical fuse 22 includes a first end 50 and a second end 52. In one embodiment of the present invention, the electrical fuse 22 may be a high-current slow-blow electrical fuse. Of course, other types of electrical fuses may be used.

  The electrical load 24 receives current from the battery 20 via the electrical fuse 22 when the electrical fuse 22 does not break (e.g., when current flows).

  As shown in FIG. 1, a diagnostic system 26 is provided to determine when the electrical fuse 22 operates degraded. The diagnostic system 26 includes a current sensor 70, a voltage sensor 72, a voltage sensor 74, a microcontroller 76, a vehicle control unit 78 and a vehicle display device 80.

  The current sensor 70 is electrically connected in series with the battery 20 and the electric fuse 22. In particular, current sensor 70 is electrically connected in series between positive terminal 40 of battery 20 and first end 50 of electric fuse 22. Current sensor 70 generates a signal that indicates the amount of current flowing through electrical fuse 22. The signal is received by the microcontroller 76.

  The voltage sensor 72 is electrically connected to the first end 50 of the electrical fuse 22. Voltage sensor 72 generates a signal indicative of a first voltage level at first end 50 of electrical fuse 22. The signal is received by the microcontroller 76.

  The voltage sensor 74 is electrically connected to the second end 52 of the electrical fuse 22. Voltage sensor 74 generates a signal indicative of a second voltage level at second end 52 of electrical fuse 22. The signal is received by the microcontroller 76.

  The microcontroller 76 includes a microprocessor 90 and a memory device 92. The microcontroller 76 is programmed to perform at least a portion of the steps described herein and execute software instructions stored in the memory device 92 to perform the relevant steps. The microcontroller 76 is in operative communication with the current sensor 70, the voltage sensor 72, the voltage sensor 74, the memory device 92 and the vehicle control 78.

  With reference to FIGS. 1 and 2, memory device 92 includes an exemplary table 100 comprising a lifetime initial resistance value associated with the electrical fuse 22 used to determine the degraded operation of the electrical fuse 22. The table 100 includes a plurality of records 102, 104, 106, 108, 110, 112, 114. Each record includes (i) a current value and (ii) a lifetime initial resistance value of the electric fuse 22 related to the current value. In particular, the plurality of records 102, 104, 106, 108, 110, 112, 114 may be set to increase the life-initial resistance as the current value increases, except for current values less than 50 amps . That is, as the amount of current flowing through the electric fuse 22 increases, the initial lifetime resistance value may increase.

  For example, referring to the record 104, the record 104 has a current value of 50 amps (Amps) and a lifetime initial resistance value of 0.22 milliohms (Milliohms). Thus, during operation, when 50 amps of current flows through the electrical fuse 22, the electrical fuse 22 has a threshold resistance value (e.g., a first value x 0.22 milliohm = It must have a resistance smaller than the threshold resistance). However, a current of 50 amperes flows through the electrical fuse 22 so that the measured resistance of the electrical fuse 22 is greater than the threshold resistance (eg, first value × 0.22 milliohm = threshold resistance) If they are the same, the electrical fuse 22 performs a degradation operation. Here, the threshold resistance may be an end-of-life resistance. That is, the end of life resistance value is obtained by multiplying the initial value of life resistance by the first value.

  The first value may be a multiplication operator, and the magnitude of the first value may be set to decrease as the current value of the table 100 increases. That is, the magnitude of the first value may decrease as the amount of current flowing through the electrical fuse 22 increases. In this case, as the magnitude of the current flowing through the electrical fuse 22 increases, the sensitivity for diagnosing the degradation of the electrical fuse 22 can be increased. Here, the first value may be set for each current value and recorded in advance in the memory device 92.

  For example, referring to the plurality of records 106, 112, the records 106 have a current value of 100 amps and a lifetime initial resistance of 0.25 milliohms. Also, the record 112 has a current value of 250 amps and a lifetime initial resistance of 0.4 milliohms. Here, in the case of the record 106 having a current value of 100 amps, the first value may be set to 1.40. Also, for the record 112 having a current value of 250 amps, the first value may be set to 1.25. That is, if the amount of current flowing through the electrical fuse 22 increases from 100 amps to 250 amps, the first value may be set to decrease from 1.40 to 1.25.

  Preferably, the first value may be calculated as a ratio of an initial end-of-life resistance value to an end-of-life resistance value. That is, the first value may be set as a ratio of the end of life resistance value to the life initial resistance value. For example, referring to FIGS. 2 and 5, in the plurality of records 104, 144 recorded in the plurality of tables 100, 140, if the current value is 50 amperes, the first value is 0..2 for 0.22. It may be a ratio of 32 or 0.32 / 0.22. Here, the first value may be set to satisfy the following formula.

Formula: End of Life Resistance Value / Life Initial Resistance Value = First Value According to another aspect of the present invention, the first value assigned to each current value decreases as the total integrated current value for the charge and discharge current increases. It can. In this case, the microprocessor 90 can integrate the current values measured by the current sensor 70 to calculate the total integrated current value, and can store and manage it in the memory device 92. The total integrated current value is not reset as 0 and is calculated from the beginning of the life of the battery 20 to the end of the life. The fact that the total integrated current value is large means that a large amount of current flows through the electric fuse 22. Therefore, the diagnostic sensitivity of the electrical fuse 22 can be increased by decreasing the first value assigned to each current value as the total integrated current value increases. If the diagnostic sensitivity is increased, maintenance of the electric fuse 22 can be facilitated by pre-diagnosing the deterioration state prior to the state of the electric fuse 22 reaching the end-of-life state.

  Referring to FIGS. 1 and 5, in another embodiment of the present invention, memory device 92 includes an end-of-life resistance associated with electrical fuse 22 used to determine degraded operation of electrical fuse 22. An exemplary table 140 is included. The table 140 includes a plurality of records 142, 144, 146, 148, 150, 152, 154. Each record includes (i) current value and (ii) end-of-life resistance associated with the electrical fuse 22. In particular, the plurality of records 142, 144, 146, 148, 150, 152, 154 may be set to increase end-of-life resistance as current increases, except for current values less than 50 amps . That is, as the amount of current flowing through the electrical fuse 22 increases, the end-of-life resistance value may increase.

  For example, referring to the record 144, the record 144 has a current value of 50 amps and an end-of-life resistance of 0.32 milliohms. Thus, in operation, when 50 amps of current flows through the electrical fuse 22, the electrical fuse 22 must have a resistance less than 0.32 milliohms, unless the electrical fuse 22 degrades. However, if a current of 50 amps flows through the electrical fuse 22 and the measured resistance of the electrical fuse 22 is greater than or equal to 0.32 milliohms, the electrical fuse 22 will operate degraded.

  Referring to FIGS. 1-4, a flow chart of a method of determining degradation of the electrical fuse 22 using stored initial life resistance values according to one embodiment of the present invention will be described.

  At stage 200, voltage sensor 72 generates a first signal indicative of a first voltage level at first end 50 of electrical fuse 22. After step 200, the method proceeds to step 202.

  At step 202, voltage sensor 74 generates a second signal indicative of a second voltage level at second end 52 of electrical fuse 22. After step 202, the method proceeds to step 204.

  At step 204, current sensor 70 generates a third signal indicative of the amount of current flowing through electrical fuse 22. After step 204, the method proceeds to step 206.

  At step 206, the microcontroller 76 determines the first voltage value and the second voltage value based on the first signal and the second signal, respectively. After step 206, the method proceeds to step 208.

  At step 208, the microcontroller 76 determines a current value based on the third signal. After step 208, the method proceeds to step 210.

  At step 210, the microcontroller 76 determines if the current value is greater than the threshold current value. If the value of step 210 is “yes”, the method proceeds to step 212. Otherwise, the method returns to step 200.

  At step 212, the microcontroller 76 determines the first resistance of the electrical fuse 22 using the following equation:

Formula: Abs (first voltage value-second voltage value) / current value Here, Abs corresponds to an absolute value function. After step 212, the method proceeds to step 214.

  At step 214, the microcontroller 76 retrieves the first stored resistance value from the plurality of initial life resistance values included in the table 100 provided in the memory device 92 using the current value as an index to the table 100. . The table 100 includes a plurality of lifetime initial resistance values and a plurality of current values related to the electric fuse 22. After step 214, the method proceeds to step 216.

  At step 216, the microcontroller 76 multiplies the first stored resistance value by the first value to determine the end of life resistance value using the following equation:

Formula: first stored resistance value × first value = end of life resistance value After step 216, the method proceeds to step 218.

  At step 218, the microcontroller 76 determines whether the first resistance value is greater than or equal to the end of life resistance value. If the value of step 218 is "yes", then the method proceeds to step 220. Otherwise, the method ends.

  At step 220, the microcontroller 76 generates a first diagnostic signal indicative of degraded operation of the electrical fuse 22. After step 220, the method proceeds to step 222.

  In step 222, the vehicle control unit 78 receives the first diagnostic signal and generates a fuse service message displayed on the vehicle display device 80 in response to the first diagnostic signal. After step 222, the method ends.

  With reference to FIGS. 1 and 5-7, a flowchart of a method of determining degradation of the electrical fuse 22 using stored end-of-life resistance values according to another embodiment of the present invention will be described.

  At stage 300, the voltage sensor 72 generates a first signal indicative of a first voltage level at the first end 50 of the electrical fuse 22. After step 300, the method proceeds to step 302.

  At step 302, voltage sensor 74 generates a second signal indicative of a second voltage level at second end 52 of electrical fuse 22. After step 302, the method proceeds to step 304.

  At step 304, current sensor 70 generates a third signal indicative of the amount of current flowing through electrical fuse 22. After step 304, the method proceeds to step 306.

  At step 306, the microcontroller 76 determines a first voltage value and a second voltage value based on the first signal and the second signal, respectively. After step 306, the method proceeds to step 308.

  At step 308, the microcontroller 76 determines a current value based on the third signal. After step 308, the method proceeds to step 310.

At step 310, the microcontroller 76 determines if the current value is greater than the threshold current value. If the value of step 310 is “yes”, the method proceeds to step 312. Otherwise, the method returns to step 300.
At step 312, the microcontroller 76 determines the first resistance value of the electrical fuse 22 using the following equation:

Formula: Abs (first voltage value-second voltage value) / current value Here, Abs corresponds to an absolute value function. After step 312, the method proceeds to step 314.

  At step 314, the microcontroller 76 retrieves the first stored resistance value from the plurality of end of life resistance values included in the table 140 provided in the memory device 92 using the current value as an index to the table 140. . The table 140 includes a plurality of end-of-life resistance values and a plurality of current values related to the electric fuse 22. After step 314, the method proceeds to step 316.

  At step 316, the microcontroller 76 determines if the first resistance value is greater than or equal to the first stored resistance value. If the value of step 316 is "yes", then the method proceeds to step 318. If not, the method ends.

  At step 318, the microcontroller 76 generates a first diagnostic signal indicative of degraded operation of the electrical fuse 22. After step 318, the method proceeds to step 320.

  In step 320, the vehicle control unit 78 receives the first diagnostic signal and generates a fuse service message displayed on the vehicle display device 80 in response to the first diagnostic signal. After step 320, the method ends.

  Vehicles that include the diagnostic system for electrical fuses described herein provide substantial advantages over other vehicles. In particular, the vehicle uses a diagnostic system to determine the degraded operation of the electrical fuse. Furthermore, the advantage of the diagnostic system is that it uses the stored lifetime initial resistance value of the electrical fuse and the multiplication operator and the calculated resistance value to determine whether the electrical fuse performs degraded operation or not Use the stored end of life resistance of the electrical fuse and the calculated resistance.

  Although the invention has been described in detail by means of limited examples, the invention is not limited to such disclosed examples. The present invention may be modified including any modification, change, alternative or corresponding change which is suitable to the spirit and scope of the present invention which has not been described. In addition, while various embodiments of the present invention have been described, aspects of the present invention may include only some of the above-described embodiments. Accordingly, the present invention is not limited by the foregoing description.

  The embodiments of the present invention described above can be embodied not only by the apparatus and the method but also by a program that realizes a function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded. Such implementation can be easily implemented by those skilled in the art to which the present invention belongs from the description of the above embodiments.

The microcontroller searches for the first stored resistance value associated with the electrical fuse from the plurality of resistance values included in the first table, using the current value as an index to the first table.

The microcontroller searches for the first stored resistance value associated with the electrical fuse from the plurality of resistance values included in the first table, using the current value as an index to the first table.

At step 214, the microcontroller 76 uses the current value as an index to the table 100 to determine the first stored resistance associated with the electrical fuse from the plurality of life initial resistance values included in the table 100 provided in the memory device 92. Search for a value The table 100 includes a plurality of lifetime initial resistance values and a plurality of current values related to the electric fuse 22. After step 214, the method proceeds to step 216.

In step 314, the microcontroller 76 uses the current value as an index to the table 140 to determine the first stored resistance associated with the electrical fuse from the plurality of end of life resistance values included in the table 140 provided in the memory device 92. Search for a value The table 140 includes a plurality of end-of-life resistance values and a plurality of current values related to the electric fuse 22. After step 314, the method proceeds to step 316.

Claims (10)

A vehicle comprising a diagnostic system for an electrical fuse electrically connected between a battery and an electrical load, the vehicle comprising:
A first voltage sensor generating a first signal indicative of a first voltage level at a first end of the electrical fuse;
A second voltage sensor generating a second signal indicative of a second voltage level at a second end of the electrical fuse;
A current sensor generating a third signal indicative of the amount of current flowing through the electrical fuse;
A microcontroller operatively connected to the first voltage sensor, the second voltage sensor, and the current sensor;
The microcontroller comprises a memory device storing a first table including a plurality of resistance values and a plurality of current values related to the electric fuse,
The microcontroller is
Determining a first voltage value and a second voltage value respectively based on the first signal and the second signal;
Determining a current value based on the third signal;
Determining a first resistance value of the electrical fuse using the first voltage value, the second voltage value, and the current value;
Retrieving a first stored resistance value from the plurality of resistance values included in the first table, using the current value as an index to the first table;
Obtaining the resistance value at the end of life by multiplying the first stored resistance value by the first value;
Generating a first diagnostic signal indicating a degraded operation of the electric fuse if the first resistance value is greater than or equal to the resistance value at the end of the life. .   The vehicle according to claim 1, wherein the plurality of resistance values of the first table correspond to a lifetime initial resistance value for the electric fuse.   The vehicle of claim 1, wherein the electrical fuse is a high current delay operated electrical fuse. Further comprising a vehicle control in operative communication with the microcontroller;
The vehicle control unit according to claim 1, wherein the vehicle control unit receives the first diagnostic signal and generates a fuse service message displayed on a vehicle display device in response to the first diagnostic signal. vehicle.   The vehicle according to claim 1, wherein the microcontroller determines the first resistance value of the electric fuse only when the current value is larger than a threshold current value. A vehicle comprising a diagnostic system for an electrical fuse electrically connected between a battery and an electrical load, the vehicle comprising:
A first voltage sensor generating a first signal indicative of a first voltage level at a first end of the electrical fuse;
A second voltage sensor generating a second signal indicative of a second voltage level at a second end of the electrical fuse;
A current sensor generating a third signal indicative of the amount of current flowing through the electrical fuse;
A microcontroller operatively connected to the first voltage sensor, the second voltage sensor, and the current sensor;
The microcontroller comprises a memory device storing a first table including a plurality of resistance values and a plurality of current values related to the electric fuse,
The microcontroller is
Determining a first voltage value and a second voltage value respectively based on the first signal and the second signal;
Determining a current value based on the third signal;
Determining a first resistance value of the electrical fuse using the first voltage value, the second voltage value, and the current value;
Retrieving a first stored resistance value from the plurality of resistance values included in the first table, using the current value as an index to the first table;
And generating a first diagnostic signal indicative of a degraded operation of the electrical fuse if the first resistance value is greater than or equal to the first stored resistance value. ,vehicle.   The vehicle according to claim 6, wherein the plurality of resistance values of the first table correspond to end-of-life resistance values for the electric fuse.   7. The vehicle of claim 6, wherein the electrical fuse is a high current delay operated electrical fuse. Further comprising a vehicle control in operative communication with the microcontroller;
The vehicle control unit according to claim 6, wherein the vehicle control unit receives the first diagnostic signal and generates a fuse service message displayed on a vehicle display device in response to the first diagnostic signal. vehicle.   The vehicle according to claim 6, wherein the microcontroller determines the first resistance value of the electric fuse only when the current value is larger than a threshold current value.